Hello all, The documentation of itk::ProcessObject::GenerateOutputInformation( ) says Generate the information describing the output data. [1]. The GenerateOutputInformation() in itkImageFileReader first create all instances of ImageIO and setup direction, spacing, etc..
If I understand correctly, the GenerateOutputInformation in the image file reader is called by UpdateOutputInformation( ) To my question, If I call reader->UpdateOutputInformation() for first time it calls reader->GenerateOutputInformation() as described in docs[2]. Now If I have a second call to reader->UpdateOutputInformation( ) ? Will it again go to GenerateOutputInformation() and createAllInstances of imageio , do the same thing again! In itkProcessObject.cxx, there is the below documentation * Call GenerateOutputInformation for subclass specific information. * Since UpdateOutputInformation propagates all the way up the pipeline, * we need to be careful here to call GenerateOutputInformation only if * necessary. Otherwise, we may cause this source to be modified which * will cause it to execute again on the next update. How can I prevent it from calling it again in class sub class of itk::ImageSource? [1] http://www.itk.org/Doxygen/html/classitk_1_1ProcessObject.html#abe61fb6b7de8c443e7af1561bd722736 -- Regards, Rashad
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